This image depicts a hydrogen fuel cell ecosystem, showing the complete cycle from renewable energy production to zero-emission transportation. Solar panels generate electricity to power electrolysis, splitting water (H₂O) into hydrogen (H₂) and oxygen (O₂). The produced hydrogen fuels a clean vehicle at a refuelling station, illustrating a sustainable hydrogen energy technology. More information can be found in the Review by S. Akin Olaleru, Nithyadharseni Palaniyandy, Bhekie B. Mamba, and Bonex W. Mwakikunga (DOI: 10.1002/open.202500181).